list 자료형의 for 문 요소 출력

num_list = [[1, 2, 3], [4, 5, 6], [7, 8, 9, 10]]

print(num_list[2])  # Output: 3
print(num_list[1][1])  # Output: 5

for sub in num_list:
    for item in sub:
        print(item,end=',')
    print()  # Print a blank line after each sublist